Jvc JA S77 Service Manual

Page 2

Contents

Page

1. Specifications ........................................................ 2
2. Block Diagram ........................................................ 2
3. Removal of Top Cover and Bottom Plate 3
4. Main Parts Location and Part Numbers ........................................ 4
5. Exploded Views and Part Numbers

5-(1) Front Panel ................................................... 5

5(2) Rear Panel .................................................... 6

5-(3) Heat Sink and Power Transistors ................... , .................. 7
7. Adjustment Procedures

6-(1) Main Amp. Center Voltage ......................................... 8

6-(2) Main Amp. Idling Current ......................................... 8

6-(3) Power Meter .................................................. 9

6-(4) Equalizer Amp. Center Voltage ...................................... 9
7. Printed Circuit Board Assy and Parts List

741) TPS-SQD AC Fuse P.C. Board Ass'y ................................... 10

7-l2) TXX-IO9B, C or D Driver Amp. P.C. Board Ass'y .......................... 11

7.(3) TXX-lloB Tone Control P.C. Board Ass'y .............................. 17

7-(4) TXX-111B Equalizer Amp. P.C. Board Assy ............................. 19
8. JA-S77 Schematic Diagram ................................................ 22
9. Packing Materials and Part Numbers .......................................... 24

10. Accessories List ....................................................... 24
11. Parts List with Specified Numbers for Designated Areas ........................ Back page
Warning:

When replacing the parts marked with A , be sure to use the designated parts to ensure safety.

Power Specifications

Areas Line Voltage & Frequency Power Consumption
U.S.A. AC 120 V, 60 Hz 305 W
CANADA AC 120 V, 60 Hz 385 VA
EUROPE AC 220 WM 50 Hz 515 W
U.K. 81 AUSTRALIA AC 240 V\/, 50 H2 515 W
OTHER AREAS AC 100/120/220/240 V\/ 515 W
Selectable, 50/60 Hz

JA-S77
No. 2440 L 1 _